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  1. C

    No spark on Merc 85hp

    If she popped with fuel sprayed into the carbs, it sounds like the carbs need some attention. One more thing. The trigger on your ignition can become intermittent. They can work for some days and then fail, and then work for some more time. Also, check the spark plug wires for resistance and...
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    Bigfoot runs for 2 seconds and dies

    Carb, EFI or something else?
  3. C

    96 Johnson 150 Setting idle

    Since you are doing your own work, you might invest in a factory service manual. Marineengine.com sells them. Have your model number handy.
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    What do these knobs do?

    In the old days, carb jets were adjustable for both high speed and low speed. That appears to be what you have. More modern carb engines just have low speed adjustments, and high speed jets are fixed. It was especially fun to adjust the dual highspeed carb jets on my '58 Fat-fifty, since you...
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    No spark on Merc 85hp

    If you spray 50::1 fuel into the carbs and she doesn't at least "pop", you have no spark, or the timing is way way off. A '73 will have timing marks on the upper cowl support. Remove spark plugs and stick a screwdriver in the top spark plug hole. Set that piston to top dead center and look at...
  6. C

    Alpha 1 Gen 1 oil fill hose

    Castrol Super Clean (and the generic "Purple Stuff") is a good degreaser. Use full strength, wait a bit then wipe it down and hose it off.
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    Cant seem to find information on motor.

    Maxrules has a serial number to year table.
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    Smoke, high temps and louder than normal

    Impeller replacement is the same on most motors. The gearcase must come off, the impeller, wearplate and 2 gaskets must be replaced, as a minimum. If the cup in the waterpump top is scratched, replace that. If the waterpump base is melted or the driveshaft seal is bad, replace the waterpump base.
  9. C

    No spark on Merc 85hp

    OK, next test is to see if you have spark. You must have +12VDC on the red wire and the adjacent white wire on the switchbox to have spark. If you have spark, spray some 50::1 into the carbs, close the choke shutters and crank her up, cold start lever all the way up. If she doesn't fire...
  10. C

    No spark on Merc 85hp

    Those quick disconnect plugs often can be the area of high resistance. For testing purposes, you can wire the battery directly to the starter solenoid and the ground bolt on the lower cowling. Standard battery cables will allow this. Are the ground straps from the block to the lower...
  11. C

    No spark on Merc 85hp

    I could not get the video to play for some reason. If she turns slow with a good battery, the wiring is bad or the starter is bad.
  12. C

    Adding A Sail

    Trawlers often had a "balance" sail. It was not meant to power them, just to act as a stabilizer.
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    Removal of Flex Seal coating from hull?

    Gee, a few more like that and I predict you will be the one looking for a home. (smile)
  14. C

    Alpha 1 Gen 1 oil fill hose

    Alpha 1 gen 1 drives did not have reservoirs, that I know of. A 1984 boat orig equipment would have been A1 G1 drives, so maybe you have replacement drives. I once had a Merc OB with a stripped gearcase drain plug. Someone had tapped it oversize and installed a brass (or bronze) insert like a...
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    anybody need a good used prop shaft??????????????

    Stainless steel prop + rock , right?
  16. C

    Idle / Slow speed timing advancement screw missing?

    Shocks from spark plug wires indicate they are bad.
  17. C

    50 amp braker

    MerCruisers have not used Ford engine in a very long time. They use either native blocks or GM blocks. A lot of the MerCruiser's blocks have a solenoid on the starter, plus a slave solenoid mounted on the lock or manifold. BTW, I am just trying to help you find your short... Not many items...
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    50 amp braker

    Gee, that implies that the starter solenoid is shorting, I would think, as starters are not usually fused. MerCruiser's have a slave starter solenoid. that would be a culprit, if you have one. Not sure you motor has one.
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    1984 Johnson 35hp 2 stroke - Ignition Switch Wiring

    Go to the maxrules web site and find a wiring diagram for your motor. Or just trace 'em out. The new ign switch has the new wiring color codes. Red is battery, purple is ign power, yellow/red is starter solenoid, purple/white is choke. Black is ground. The black/white is ign killer.
  20. C

    50 amp braker

    Normally a 50A breaker (600watts) is not enough to fuse a starter. They can easily pull 200A on a 5.0L motor in normal operation. Starters are therefore usually not fused. I would trace the breaker wire and see where it goes. Power Trim and slave solenoid, plus the balance of the dashboard...
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